Rats and mice

[Freakie_frog]

Now my new bp Yoshi, I was told eats one live med rat once a week. So
1. Is there any way I can get him on mice or are they just two small?
2. He is 4.5 ft and around three yrs, should he be fed every week?

At 4.5 feet long he should be on something as big as large rat. I would think. but that depends on his girth.